# WKU PHYS 260 - Physics 260 Exam 2 (4 pages)

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## Physics 260 Exam 2

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## Physics 260 Exam 2

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Pages:
4
School:
Western Kentucky University
Course:
Phys 260 - Intro Electricity & Magnetism
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Physics 260 MWF 10 30 11 30 Dr Womble Name THE MORE WORK SHOWN THE MORE CREDIT GIVEN Constants k 1 4 o 9 x 109 N m2 C2 o 8 85 x 10 12 C2 N m2 0 4 x 10 7 T m A mass electron me 9 11 x 10 31 kg electron charge e 1 6 x 10 19 C Conversions 1 eV 1 6 x 10 19 J 1 The arrows in the object below indicate the initial orientation of magnetic dipoles in the material of which the object is composed An external magnetic field Bext which is directed toward the left of the page is turned on Bext a If the material of the object is ferromagnetic what is the orientation of the magnetic dipoles after the external magnetic field is applied What are typical values of the magnetic susceptibility b If the material of the object is paramagnetic what is the orientation of the magnetic dipoles after the external magnetic field is applied Are there more or less dipoles reacting to the external field in the paramagnetic material than the ferromagnetic material c If the material of the object is diamagnetic what is the orientation of the magnetic dipoles after the external magnetic field is applied Are there more or less dipoles reacting to the external field in the diamagnetic material than the ferromagnetic material 2 The figure below shows a cross section of a coaxial cable and gives its radii a b c Equal but opposite currents i are uniformly distributed in the two conductors Derive expressions for the magnetic field B r for the following regions in Hint The left hand side of Ampere s Law for this geometry is B d s B 2 r a r a b a r b a c b c b r c d r c 3 An electron of mass m orbits an atom that has 19 protons at a radius of r with a speed v Treating the circular path as a current loop with constant current equal to its average current find the magnetic dipole moment of the atom as a function of the orbital angular momentum L 4 A rectangular coil of 10 turns and of length 10 cm and width 25 cm is rotated at frequency of 60 Hz in a uniform magnetic field B 10 mT as shown in the figure below

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